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The Community Structure of Phytoplankton in Winter and Summer Around Wangdol-cho

동해 왕돌초 주변 해역의 동계와 하계 식물플랑크톤 군집 분포

  • Shim, Jeong-Min (East Sea Fisheries Research and Development Institute, NFRDI) ;
  • Jin, Hyun-Gook (East Sea Fisheries Research and Development Institute, NFRDI) ;
  • Sung, Ki-Tack (Ocean Research Division, National Fisheries Research and Development Institute) ;
  • Hwang, Jae-Dong (East Sea Fisheries Research and Development Institute, NFRDI) ;
  • Yun, Suk-Hyun (East Sea Fisheries Research and Development Institute, NFRDI) ;
  • Lee, Yong-Hwa (East Sea Fisheries Research and Development Institute, NFRDI) ;
  • Kim, Young-Suk (East Sea Fisheries Research and Development Institute, NFRDI) ;
  • Kwon, Ki-Young (East Sea Fisheries Research and Development Institute, NFRDI)
  • 심정민 (국립수산과학원 동해수산연구소) ;
  • 진현국 (국립수산과학원 동해수산연구소) ;
  • 성기탁 (국립수산과학원 해양연구과) ;
  • 황재동 (국립수산과학원 동해수산연구소) ;
  • 윤석현 (국립수산과학원 동해수산연구소) ;
  • 이용화 (국립수산과학원 동해수산연구소) ;
  • 김영숙 (국립수산과학원 동해수산연구소) ;
  • 권기영 (국립수산과학원 동해수산연구소)
  • Published : 2008.12.31

Abstract

Wangdol-cho, located 23 km offshore of Hupo in southwest of East Sea, is underwater rock floor, called to Wangdol-Am or Wangdol-Jam and has three tops as Mat-Jam, Middle-Jam and Set-Jam. The composition, abundance, diversity and community structure were investigated in winter and summer in 2002 around Wangdol-cho. The temperature around the Northwest and Southeast part of Wangdol-cho was influenced by the North Korea Cold Current (NKCC) and East Korea Warm Current (EKWC), respectively. Nutrient and chlorophyll-a concentration were higher at the top of Wangdol-cho than other area. A total of 41 genera and 78 species of phytoplankton were identified. The average cell abundance of phytoplankton in winter and summer were $286{\times}10^3\;cells/m^3,\;432{\times}10^3\;cells/m^3$ respectively. The largest community was Bacillariophyta containing 52 taxa. The dominant species were Lauderia anulata and Coscinodiscus spp. which preferred cold water in winter. In contrast, warm water species such as Rhizosolenia stolterfothii and Ceratium spp. were dominant in summer. The average species diversity index of phytoplankton in winter was higher than that in summer. According to dominant species and standing crops, phytoplankton community resulted in a clear separation. One group was western area, which showed low density, and the other was eastern area, which showed the higher density. The abundance and species composition of phytoplankton. were affected by topological characteristics around Wangdol-cho.

Keywords

Phytoplankton;Phytoplankton community;Species composition;Abundance

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